Project templates are useful because you can specify all of the information that you would normally want to include when creating a new project such as project structure, budget, and so on.
In Baan IV/V, project templates do not exist, but you can set up a project template by creating a regular project, and setting the status to simulated or free. This is done so that the project does not create plans. Under this scenario, you can easily copy one project to another.
In LN, when you create a new project, a template can be used as the starting point. This is similar to copying a normal project, but unlike normal projects, no costs or revenues can be posted on a template.